drivers/media/usb/em28xx/em28xx-input.c

   1 /*
   2   handle em28xx IR remotes via linux kernel input layer.
   3
   4    Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
   5                       Markus Rechberger <mrechberger@gmail.com>
   6                       Mauro Carvalho Chehab <mchehab@infradead.org>
   7                       Sascha Sommer <saschasommer@freenet.de>
   8
   9   This program is free software; you can redistribute it and/or modify
  10   it under the terms of the GNU General Public License as published by
  11   the Free Software Foundation; either version 2 of the License, or
  12   (at your option) any later version.
  13
  14   This program is distributed in the hope that it will be useful,
  15   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17   GNU General Public License for more details.
  18
  19   You should have received a copy of the GNU General Public License
  20   along with this program; if not, write to the Free Software
  21   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23
  24 #include <linux/module.h>
  25 #include <linux/init.h>
  26 #include <linux/delay.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/usb.h>
  29 #include <linux/slab.h>
  30 #include <linux/bitrev.h>
  31
  32 #include "em28xx.h"
  33
  34 #define EM28XX_SNAPSHOT_KEY                             KEY_CAMERA
  35 #define EM28XX_BUTTONS_DEBOUNCED_QUERY_INTERVAL         500 /* [ms] */
  36 #define EM28XX_BUTTONS_VOLATILE_QUERY_INTERVAL          100 /* [ms] */
  37
  38 static unsigned int ir_debug;
  39 module_param(ir_debug, int, 0644);
  40 MODULE_PARM_DESC(ir_debug, "enable debug messages [IR]");
  41
  42 #define MODULE_NAME "em28xx"
  43
  44 #define dprintk(fmt, arg...) \
  45         if (ir_debug) { \
  46                 printk(KERN_DEBUG "%s/ir: " fmt, ir->name , ## arg); \
  47         }
  48
  49 /**********************************************************
  50  Polling structure used by em28xx IR's
  51  **********************************************************/
  52
  53 struct em28xx_ir_poll_result {
  54         unsigned int toggle_bit:1;
  55         unsigned int read_count:7;
  56
  57         enum rc_type protocol;
  58         u32 scancode;
  59 };
  60
  61 struct em28xx_IR {
  62         struct em28xx *dev;
  63         struct rc_dev *rc;
  64         char name[32];
  65         char phys[32];
  66
  67         /* poll decoder */
  68         int polling;
  69         struct delayed_work work;
  70         unsigned int full_code:1;
  71         unsigned int last_readcount;
  72         u64 rc_type;
  73
  74         struct i2c_client *i2c_client;
  75
  76         int  (*get_key_i2c)(struct i2c_client *ir, enum rc_type *protocol, u32 *scancode);
  77         int  (*get_key)(struct em28xx_IR *, struct em28xx_ir_poll_result *);
  78 };
  79
  80 /**********************************************************
  81  I2C IR based get keycodes - should be used with ir-kbd-i2c
  82  **********************************************************/
  83
  84 static int em28xx_get_key_terratec(struct i2c_client *i2c_dev,
  85                                    enum rc_type *protocol, u32 *scancode)
  86 {
  87         unsigned char b;
  88
  89         /* poll IR chip */
  90         if (1 != i2c_master_recv(i2c_dev, &b, 1))
  91                 return -EIO;
  92
  93         /* it seems that 0xFE indicates that a button is still hold
  94            down, while 0xff indicates that no button is hold down. */
  95
  96         if (b == 0xff)
  97                 return 0;
  98
  99         if (b == 0xfe)
 100                 /* keep old data */
 101                 return 1;
 102
 103         *protocol = RC_TYPE_UNKNOWN;
 104         *scancode = b;
 105         return 1;
 106 }
 107
 108 static int em28xx_get_key_em_haup(struct i2c_client *i2c_dev,
 109                                   enum rc_type *protocol, u32 *scancode)
 110 {
 111         unsigned char buf[2];
 112         int size;
 113
 114         /* poll IR chip */
 115         size = i2c_master_recv(i2c_dev, buf, sizeof(buf));
 116
 117         if (size != 2)
 118                 return -EIO;
 119
 120         /* Does eliminate repeated parity code */
 121         if (buf[1] == 0xff)
 122                 return 0;
 123
 124         /*
 125          * Rearranges bits to the right order.
 126          * The bit order were determined experimentally by using
 127          * The original Hauppauge Grey IR and another RC5 that uses addr=0x08
 128          * The RC5 code has 14 bits, but we've experimentally determined
 129          * the meaning for only 11 bits.
 130          * So, the code translation is not complete. Yet, it is enough to
 131          * work with the provided RC5 IR.
 132          */
 133         *protocol = RC_TYPE_RC5;
 134         *scancode = (bitrev8(buf[1]) & 0x1f) << 8 | bitrev8(buf[0]) >> 2;
 135         return 1;
 136 }
 137
 138 static int em28xx_get_key_pinnacle_usb_grey(struct i2c_client *i2c_dev,
 139                                             enum rc_type *protocol, u32 *scancode)
 140 {
 141         unsigned char buf[3];
 142
 143         /* poll IR chip */
 144
 145         if (3 != i2c_master_recv(i2c_dev, buf, 3))
 146                 return -EIO;
 147
 148         if (buf[0] != 0x00)
 149                 return 0;
 150
 151         *protocol = RC_TYPE_UNKNOWN;
 152         *scancode = buf[2] & 0x3f;
 153         return 1;
 154 }
 155
 156 static int em28xx_get_key_winfast_usbii_deluxe(struct i2c_client *i2c_dev,
 157                                                enum rc_type *protocol, u32 *scancode)
 158 {
 159         unsigned char subaddr, keydetect, key;
 160
 161         struct i2c_msg msg[] = { { .addr = i2c_dev->addr, .flags = 0, .buf = &subaddr, .len = 1},
 162                                  { .addr = i2c_dev->addr, .flags = I2C_M_RD, .buf = &keydetect, .len = 1} };
 163
 164         subaddr = 0x10;
 165         if (2 != i2c_transfer(i2c_dev->adapter, msg, 2))
 166                 return -EIO;
 167         if (keydetect == 0x00)
 168                 return 0;
 169
 170         subaddr = 0x00;
 171         msg[1].buf = &key;
 172         if (2 != i2c_transfer(i2c_dev->adapter, msg, 2))
 173                 return -EIO;
 174         if (key == 0x00)
 175                 return 0;
 176
 177         *protocol = RC_TYPE_UNKNOWN;
 178         *scancode = key;
 179         return 1;
 180 }
 181
 182 /**********************************************************
 183  Poll based get keycode functions
 184  **********************************************************/
 185
 186 /* This is for the em2860/em2880 */
 187 static int default_polling_getkey(struct em28xx_IR *ir,
 188                                   struct em28xx_ir_poll_result *poll_result)
 189 {
 190         struct em28xx *dev = ir->dev;
 191         int rc;
 192         u8 msg[3] = { 0, 0, 0 };
 193
 194         /* Read key toggle, brand, and key code
 195            on registers 0x45, 0x46 and 0x47
 196          */
 197         rc = dev->em28xx_read_reg_req_len(dev, 0, EM28XX_R45_IR,
 198                                           msg, sizeof(msg));
 199         if (rc < 0)
 200                 return rc;
 201
 202         /* Infrared toggle (Reg 0x45[7]) */
 203         poll_result->toggle_bit = (msg[0] >> 7);
 204
 205         /* Infrared read count (Reg 0x45[6:0] */
 206         poll_result->read_count = (msg[0] & 0x7f);
 207
 208         /* Remote Control Address/Data (Regs 0x46/0x47) */
 209         switch (ir->rc_type) {
 210         case RC_BIT_RC5:
 211                 poll_result->protocol = RC_TYPE_RC5;
 212                 poll_result->scancode = RC_SCANCODE_RC5(msg[1], msg[2]);
 213                 break;
 214
 215         case RC_BIT_NEC:
 216                 poll_result->protocol = RC_TYPE_NEC;
 217                 poll_result->scancode = RC_SCANCODE_NEC(msg[1], msg[2]);
 218                 break;
 219
 220         default:
 221                 poll_result->protocol = RC_TYPE_UNKNOWN;
 222                 poll_result->scancode = msg[1] << 8 | msg[2];
 223                 break;
 224         }
 225
 226         return 0;
 227 }
 228
 229 static int em2874_polling_getkey(struct em28xx_IR *ir,
 230                                  struct em28xx_ir_poll_result *poll_result)
 231 {
 232         struct em28xx *dev = ir->dev;
 233         int rc;
 234         u8 msg[5] = { 0, 0, 0, 0, 0 };
 235
 236         /* Read key toggle, brand, and key code
 237            on registers 0x51-55
 238          */
 239         rc = dev->em28xx_read_reg_req_len(dev, 0, EM2874_R51_IR,
 240                                           msg, sizeof(msg));
 241         if (rc < 0)
 242                 return rc;
 243
 244         /* Infrared toggle (Reg 0x51[7]) */
 245         poll_result->toggle_bit = (msg[0] >> 7);
 246
 247         /* Infrared read count (Reg 0x51[6:0] */
 248         poll_result->read_count = (msg[0] & 0x7f);
 249
 250         /*
 251          * Remote Control Address (Reg 0x52)
 252          * Remote Control Data (Reg 0x53-0x55)
 253          */
 254         switch (ir->rc_type) {
 255         case RC_BIT_RC5:
 256                 poll_result->protocol = RC_TYPE_RC5;
 257                 poll_result->scancode = RC_SCANCODE_RC5(msg[1], msg[2]);
 258                 break;
 259
 260         case RC_BIT_NEC:
 261                 poll_result->protocol = RC_TYPE_RC5;
 262                 poll_result->scancode = msg[1] << 8 | msg[2];
 263                 if ((msg[3] ^ msg[4]) != 0xff)          /* 32 bits NEC */
 264                         poll_result->scancode = RC_SCANCODE_NEC32((msg[1] << 24) |
 265                                                                   (msg[2] << 16) |
 266                                                                   (msg[3] << 8)  |
 267                                                                   (msg[4]));
 268                 else if ((msg[1] ^ msg[2]) != 0xff)     /* 24 bits NEC */
 269                         poll_result->scancode = RC_SCANCODE_NECX(msg[1] << 8 |
 270                                                                  msg[2], msg[3]);
 271                 else                                    /* Normal NEC */
 272                         poll_result->scancode = RC_SCANCODE_NEC(msg[1], msg[3]);
 273                 break;
 274
 275         case RC_BIT_RC6_0:
 276                 poll_result->protocol = RC_TYPE_RC6_0;
 277                 poll_result->scancode = RC_SCANCODE_RC6_0(msg[1], msg[2]);
 278                 break;
 279
 280         default:
 281                 poll_result->protocol = RC_TYPE_UNKNOWN;
 282                 poll_result->scancode = (msg[1] << 24) | (msg[2] << 16) |
 283                                         (msg[3] << 8)  | msg[4];
 284                 break;
 285         }
 286
 287         return 0;
 288 }
 289
 290 /**********************************************************
 291  Polling code for em28xx
 292  **********************************************************/
 293
 294 static int em28xx_i2c_ir_handle_key(struct em28xx_IR *ir)
 295 {
 296         static u32 scancode;
 297         enum rc_type protocol;
 298         int rc;
 299
 300         rc = ir->get_key_i2c(ir->i2c_client, &protocol, &scancode);
 301         if (rc < 0) {
 302                 dprintk("ir->get_key_i2c() failed: %d\n", rc);
 303                 return rc;
 304         }
 305
 306         if (rc) {
 307                 dprintk("%s: proto = 0x%04x, scancode = 0x%04x\n",
 308                         __func__, protocol, scancode);
 309                 rc_keydown(ir->rc, protocol, scancode, 0);
 310         }
 311         return 0;
 312 }
 313
 314 static void em28xx_ir_handle_key(struct em28xx_IR *ir)
 315 {
 316         int result;
 317         struct em28xx_ir_poll_result poll_result;
 318
 319         /* read the registers containing the IR status */
 320         result = ir->get_key(ir, &poll_result);
 321         if (unlikely(result < 0)) {
 322                 dprintk("ir->get_key() failed: %d\n", result);
 323                 return;
 324         }
 325
 326         if (unlikely(poll_result.read_count != ir->last_readcount)) {
 327                 dprintk("%s: toggle: %d, count: %d, key 0x%04x\n", __func__,
 328                         poll_result.toggle_bit, poll_result.read_count,
 329                         poll_result.scancode);
 330                 if (ir->full_code)
 331                         rc_keydown(ir->rc,
 332                                    poll_result.protocol,
 333                                    poll_result.scancode,
 334                                    poll_result.toggle_bit);
 335                 else
 336                         rc_keydown(ir->rc,
 337                                    RC_TYPE_UNKNOWN,
 338                                    poll_result.scancode & 0xff,
 339                                    poll_result.toggle_bit);
 340
 341                 if (ir->dev->chip_id == CHIP_ID_EM2874 ||
 342                     ir->dev->chip_id == CHIP_ID_EM2884)
 343                         /* The em2874 clears the readcount field every time the
 344                            register is read.  The em2860/2880 datasheet says that it
 345                            is supposed to clear the readcount, but it doesn't.  So with
 346                            the em2874, we are looking for a non-zero read count as
 347                            opposed to a readcount that is incrementing */
 348                         ir->last_readcount = 0;
 349                 else
 350                         ir->last_readcount = poll_result.read_count;
 351         }
 352 }
 353
 354 static void em28xx_ir_work(struct work_struct *work)
 355 {
 356         struct em28xx_IR *ir = container_of(work, struct em28xx_IR, work.work);
 357
 358         if (ir->i2c_client) /* external i2c device */
 359                 em28xx_i2c_ir_handle_key(ir);
 360         else /* internal device */
 361                 em28xx_ir_handle_key(ir);
 362         schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
 363 }
 364
 365 static int em28xx_ir_start(struct rc_dev *rc)
 366 {
 367         struct em28xx_IR *ir = rc->priv;
 368
 369         INIT_DELAYED_WORK(&ir->work, em28xx_ir_work);
 370         schedule_delayed_work(&ir->work, 0);
 371
 372         return 0;
 373 }
 374
 375 static void em28xx_ir_stop(struct rc_dev *rc)
 376 {
 377         struct em28xx_IR *ir = rc->priv;
 378
 379         cancel_delayed_work_sync(&ir->work);
 380 }
 381
 382 static int em2860_ir_change_protocol(struct rc_dev *rc_dev, u64 *rc_type)
 383 {
 384         struct em28xx_IR *ir = rc_dev->priv;
 385         struct em28xx *dev = ir->dev;
 386
 387         /* Adjust xclk based on IR table for RC5/NEC tables */
 388         if (*rc_type & RC_BIT_RC5) {
 389                 dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
 390                 ir->full_code = 1;
 391                 *rc_type = RC_BIT_RC5;
 392         } else if (*rc_type & RC_BIT_NEC) {
 393                 dev->board.xclk &= ~EM28XX_XCLK_IR_RC5_MODE;
 394                 ir->full_code = 1;
 395                 *rc_type = RC_BIT_NEC;
 396         } else if (*rc_type & RC_BIT_UNKNOWN) {
 397                 *rc_type = RC_BIT_UNKNOWN;
 398         } else {
 399                 *rc_type = ir->rc_type;
 400                 return -EINVAL;
 401         }
 402         em28xx_write_reg_bits(dev, EM28XX_R0F_XCLK, dev->board.xclk,
 403                               EM28XX_XCLK_IR_RC5_MODE);
 404
 405         ir->rc_type = *rc_type;
 406
 407         return 0;
 408 }
 409
 410 static int em2874_ir_change_protocol(struct rc_dev *rc_dev, u64 *rc_type)
 411 {
 412         struct em28xx_IR *ir = rc_dev->priv;
 413         struct em28xx *dev = ir->dev;
 414         u8 ir_config = EM2874_IR_RC5;
 415
 416         /* Adjust xclk and set type based on IR table for RC5/NEC/RC6 tables */
 417         if (*rc_type & RC_BIT_RC5) {
 418                 dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
 419                 ir->full_code = 1;
 420                 *rc_type = RC_BIT_RC5;
 421         } else if (*rc_type & RC_BIT_NEC) {
 422                 dev->board.xclk &= ~EM28XX_XCLK_IR_RC5_MODE;
 423                 ir_config = EM2874_IR_NEC | EM2874_IR_NEC_NO_PARITY;
 424                 ir->full_code = 1;
 425                 *rc_type = RC_BIT_NEC;
 426         } else if (*rc_type & RC_BIT_RC6_0) {
 427                 dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
 428                 ir_config = EM2874_IR_RC6_MODE_0;
 429                 ir->full_code = 1;
 430                 *rc_type = RC_BIT_RC6_0;
 431         } else if (*rc_type & RC_BIT_UNKNOWN) {
 432                 *rc_type = RC_BIT_UNKNOWN;
 433         } else {
 434                 *rc_type = ir->rc_type;
 435                 return -EINVAL;
 436         }
 437         em28xx_write_regs(dev, EM2874_R50_IR_CONFIG, &ir_config, 1);
 438         em28xx_write_reg_bits(dev, EM28XX_R0F_XCLK, dev->board.xclk,
 439                               EM28XX_XCLK_IR_RC5_MODE);
 440
 441         ir->rc_type = *rc_type;
 442
 443         return 0;
 444 }
 445 static int em28xx_ir_change_protocol(struct rc_dev *rc_dev, u64 *rc_type)
 446 {
 447         struct em28xx_IR *ir = rc_dev->priv;
 448         struct em28xx *dev = ir->dev;
 449
 450         /* Setup the proper handler based on the chip */
 451         switch (dev->chip_id) {
 452         case CHIP_ID_EM2860:
 453         case CHIP_ID_EM2883:
 454                 return em2860_ir_change_protocol(rc_dev, rc_type);
 455         case CHIP_ID_EM2884:
 456         case CHIP_ID_EM2874:
 457         case CHIP_ID_EM28174:
 458         case CHIP_ID_EM28178:
 459                 return em2874_ir_change_protocol(rc_dev, rc_type);
 460         default:
 461                 printk("Unrecognized em28xx chip id 0x%02x: IR not supported\n",
 462                        dev->chip_id);
 463                 return -EINVAL;
 464         }
 465 }
 466
 467 static int em28xx_probe_i2c_ir(struct em28xx *dev)
 468 {
 469         int i = 0;
 470         /* Leadtek winfast tv USBII deluxe can find a non working IR-device */
 471         /* at address 0x18, so if that address is needed for another board in */
 472         /* the future, please put it after 0x1f. */
 473         const unsigned short addr_list[] = {
 474                  0x1f, 0x30, 0x47, I2C_CLIENT_END
 475         };
 476
 477         while (addr_list[i] != I2C_CLIENT_END) {
 478                 if (i2c_probe_func_quick_read(&dev->i2c_adap[dev->def_i2c_bus], addr_list[i]) == 1)
 479                         return addr_list[i];
 480                 i++;
 481         }
 482
 483         return -ENODEV;
 484 }
 485
 486 /**********************************************************
 487  Handle buttons
 488  **********************************************************/
 489
 490 static void em28xx_query_buttons(struct work_struct *work)
 491 {
 492         struct em28xx *dev =
 493                 container_of(work, struct em28xx, buttons_query_work.work);
 494         u8 i, j;
 495         int regval;
 496         bool is_pressed, was_pressed;
 497         const struct em28xx_led *led;
 498
 499         /* Poll and evaluate all addresses */
 500         for (i = 0; i < dev->num_button_polling_addresses; i++) {
 501                 /* Read value from register */
 502                 regval = em28xx_read_reg(dev, dev->button_polling_addresses[i]);
 503                 if (regval < 0)
 504                         continue;
 505                 /* Check states of the buttons and act */
 506                 j = 0;
 507                 while (dev->board.buttons[j].role >= 0 &&
 508                        dev->board.buttons[j].role < EM28XX_NUM_BUTTON_ROLES) {
 509                         struct em28xx_button *button = &dev->board.buttons[j];
 510                         /* Check if button uses the current address */
 511                         if (button->reg_r != dev->button_polling_addresses[i]) {
 512                                 j++;
 513                                 continue;
 514                         }
 515                         /* Determine if button is and was pressed last time */
 516                         is_pressed = regval & button->mask;
 517                         was_pressed = dev->button_polling_last_values[i]
 518                                        & button->mask;
 519                         if (button->inverted) {
 520                                 is_pressed = !is_pressed;
 521                                 was_pressed = !was_pressed;
 522                         }
 523                         /* Clear button state (if needed) */
 524                         if (is_pressed && button->reg_clearing)
 525                                 em28xx_write_reg(dev, button->reg_clearing,
 526                                                  (~regval & button->mask)
 527                                                     | (regval & ~button->mask));
 528                         /* Handle button state */
 529                         if (!is_pressed || was_pressed) {
 530                                 j++;
 531                                 continue;
 532                         }
 533                         switch (button->role) {
 534                         case EM28XX_BUTTON_SNAPSHOT:
 535                                 /* Emulate the keypress */
 536                                 input_report_key(dev->sbutton_input_dev,
 537                                                  EM28XX_SNAPSHOT_KEY, 1);
 538                                 /* Unpress the key */
 539                                 input_report_key(dev->sbutton_input_dev,
 540                                                  EM28XX_SNAPSHOT_KEY, 0);
 541                                 break;
 542                         case EM28XX_BUTTON_ILLUMINATION:
 543                                 led = em28xx_find_led(dev,
 544                                                       EM28XX_LED_ILLUMINATION);
 545                                 /* Switch illumination LED on/off */
 546                                 if (led)
 547                                         em28xx_toggle_reg_bits(dev,
 548                                                                led->gpio_reg,
 549                                                                led->gpio_mask);
 550                                 break;
 551                         default:
 552                                 WARN_ONCE(1, "BUG: unhandled button role.");
 553                         }
 554                         /* Next button */
 555                         j++;
 556                 }
 557                 /* Save current value for comparison during the next polling */
 558                 dev->button_polling_last_values[i] = regval;
 559         }
 560         /* Schedule next poll */
 561         schedule_delayed_work(&dev->buttons_query_work,
 562                               msecs_to_jiffies(dev->button_polling_interval));
 563 }
 564
 565 static int em28xx_register_snapshot_button(struct em28xx *dev)
 566 {
 567         struct input_dev *input_dev;
 568         int err;
 569
 570         em28xx_info("Registering snapshot button...\n");
 571         input_dev = input_allocate_device();
 572         if (!input_dev)
 573                 return -ENOMEM;
 574
 575         usb_make_path(dev->udev, dev->snapshot_button_path,
 576                       sizeof(dev->snapshot_button_path));
 577         strlcat(dev->snapshot_button_path, "/sbutton",
 578                 sizeof(dev->snapshot_button_path));
 579
 580         input_dev->name = "em28xx snapshot button";
 581         input_dev->phys = dev->snapshot_button_path;
 582         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
 583         set_bit(EM28XX_SNAPSHOT_KEY, input_dev->keybit);
 584         input_dev->keycodesize = 0;
 585         input_dev->keycodemax = 0;
 586         input_dev->id.bustype = BUS_USB;
 587         input_dev->id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
 588         input_dev->id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
 589         input_dev->id.version = 1;
 590         input_dev->dev.parent = &dev->udev->dev;
 591
 592         err = input_register_device(input_dev);
 593         if (err) {
 594                 em28xx_errdev("input_register_device failed\n");
 595                 input_free_device(input_dev);
 596                 return err;
 597         }
 598
 599         dev->sbutton_input_dev = input_dev;
 600         return 0;
 601 }
 602
 603 static void em28xx_init_buttons(struct em28xx *dev)
 604 {
 605         u8  i = 0, j = 0;
 606         bool addr_new = false;
 607
 608         dev->button_polling_interval = EM28XX_BUTTONS_DEBOUNCED_QUERY_INTERVAL;
 609         while (dev->board.buttons[i].role >= 0 &&
 610                dev->board.buttons[i].role < EM28XX_NUM_BUTTON_ROLES) {
 611                 struct em28xx_button *button = &dev->board.buttons[i];
 612                 /* Check if polling address is already on the list */
 613                 addr_new = true;
 614                 for (j = 0; j < dev->num_button_polling_addresses; j++) {
 615                         if (button->reg_r == dev->button_polling_addresses[j]) {
 616                                 addr_new = false;
 617                                 break;
 618                         }
 619                 }
 620                 /* Check if max. number of polling addresses is exceeded */
 621                 if (addr_new && dev->num_button_polling_addresses
 622                                            >= EM28XX_NUM_BUTTON_ADDRESSES_MAX) {
 623                         WARN_ONCE(1, "BUG: maximum number of button polling addresses exceeded.");
 624                         goto next_button;
 625                 }
 626                 /* Button role specific checks and actions */
 627                 if (button->role == EM28XX_BUTTON_SNAPSHOT) {
 628                         /* Register input device */
 629                         if (em28xx_register_snapshot_button(dev) < 0)
 630                                 goto next_button;
 631                 } else if (button->role == EM28XX_BUTTON_ILLUMINATION) {
 632                         /* Check sanity */
 633                         if (!em28xx_find_led(dev, EM28XX_LED_ILLUMINATION)) {
 634                                 em28xx_errdev("BUG: illumination button defined, but no illumination LED.\n");
 635                                 goto next_button;
 636                         }
 637                 }
 638                 /* Add read address to list of polling addresses */
 639                 if (addr_new) {
 640                         unsigned int index = dev->num_button_polling_addresses;
 641                         dev->button_polling_addresses[index] = button->reg_r;
 642                         dev->num_button_polling_addresses++;
 643                 }
 644                 /* Reduce polling interval if necessary */
 645                 if (!button->reg_clearing)
 646                         dev->button_polling_interval =
 647                                          EM28XX_BUTTONS_VOLATILE_QUERY_INTERVAL;
 648 next_button:
 649                 /* Next button */
 650                 i++;
 651         }
 652
 653         /* Start polling */
 654         if (dev->num_button_polling_addresses) {
 655                 memset(dev->button_polling_last_values, 0,
 656                        EM28XX_NUM_BUTTON_ADDRESSES_MAX);
 657                 schedule_delayed_work(&dev->buttons_query_work,
 658                                       msecs_to_jiffies(dev->button_polling_interval));
 659         }
 660 }
 661
 662 static void em28xx_shutdown_buttons(struct em28xx *dev)
 663 {
 664         /* Cancel polling */
 665         cancel_delayed_work_sync(&dev->buttons_query_work);
 666         /* Clear polling addresses list */
 667         dev->num_button_polling_addresses = 0;
 668         /* Deregister input devices */
 669         if (dev->sbutton_input_dev != NULL) {
 670                 em28xx_info("Deregistering snapshot button\n");
 671                 input_unregister_device(dev->sbutton_input_dev);
 672                 dev->sbutton_input_dev = NULL;
 673         }
 674 }
 675
 676 static int em28xx_ir_init(struct em28xx *dev)
 677 {
 678         struct em28xx_IR *ir;
 679         struct rc_dev *rc;
 680         int err = -ENOMEM;
 681         u64 rc_type;
 682         u16 i2c_rc_dev_addr = 0;
 683
 684         if (dev->is_audio_only) {
 685                 /* Shouldn't initialize IR for this interface */
 686                 return 0;
 687         }
 688
 689         kref_get(&dev->ref);
 690         INIT_DELAYED_WORK(&dev->buttons_query_work, em28xx_query_buttons);
 691
 692         if (dev->board.buttons)
 693                 em28xx_init_buttons(dev);
 694
 695         if (dev->board.has_ir_i2c) {
 696                 i2c_rc_dev_addr = em28xx_probe_i2c_ir(dev);
 697                 if (!i2c_rc_dev_addr) {
 698                         dev->board.has_ir_i2c = 0;
 699                         em28xx_warn("No i2c IR remote control device found.\n");
 700                         return -ENODEV;
 701                 }
 702         }
 703
 704         if (dev->board.ir_codes == NULL && !dev->board.has_ir_i2c) {
 705                 /* No remote control support */
 706                 em28xx_warn("Remote control support is not available for "
 707                                 "this card.\n");
 708                 return 0;
 709         }
 710
 711         em28xx_info("Registering input extension\n");
 712
 713         ir = kzalloc(sizeof(*ir), GFP_KERNEL);
 714         if (!ir)
 715                 return -ENOMEM;
 716         rc = rc_allocate_device();
 717         if (!rc)
 718                 goto error;
 719
 720         /* record handles to ourself */
 721         ir->dev = dev;
 722         dev->ir = ir;
 723         ir->rc = rc;
 724
 725         rc->priv = ir;
 726         rc->open = em28xx_ir_start;
 727         rc->close = em28xx_ir_stop;
 728
 729         if (dev->board.has_ir_i2c) {    /* external i2c device */
 730                 switch (dev->model) {
 731                 case EM2800_BOARD_TERRATEC_CINERGY_200:
 732                 case EM2820_BOARD_TERRATEC_CINERGY_250:
 733                         rc->map_name = RC_MAP_EM_TERRATEC;
 734                         ir->get_key_i2c = em28xx_get_key_terratec;
 735                         break;
 736                 case EM2820_BOARD_PINNACLE_USB_2:
 737                         rc->map_name = RC_MAP_PINNACLE_GREY;
 738                         ir->get_key_i2c = em28xx_get_key_pinnacle_usb_grey;
 739                         break;
 740                 case EM2820_BOARD_HAUPPAUGE_WINTV_USB_2:
 741                         rc->map_name = RC_MAP_HAUPPAUGE;
 742                         ir->get_key_i2c = em28xx_get_key_em_haup;
 743                         rc->allowed_protocols = RC_BIT_RC5;
 744                         break;
 745                 case EM2820_BOARD_LEADTEK_WINFAST_USBII_DELUXE:
 746                         rc->map_name = RC_MAP_WINFAST_USBII_DELUXE;
 747                         ir->get_key_i2c = em28xx_get_key_winfast_usbii_deluxe;
 748                         break;
 749                 default:
 750                         err = -ENODEV;
 751                         goto error;
 752                 }
 753
 754                 ir->i2c_client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
 755                 if (!ir->i2c_client)
 756                         goto error;
 757                 ir->i2c_client->adapter = &ir->dev->i2c_adap[dev->def_i2c_bus];
 758                 ir->i2c_client->addr = i2c_rc_dev_addr;
 759                 ir->i2c_client->flags = 0;
 760                 /* NOTE: all other fields of i2c_client are unused */
 761         } else {        /* internal device */
 762                 switch (dev->chip_id) {
 763                 case CHIP_ID_EM2860:
 764                 case CHIP_ID_EM2883:
 765                         rc->allowed_protocols = RC_BIT_RC5 | RC_BIT_NEC;
 766                         ir->get_key = default_polling_getkey;
 767                         break;
 768                 case CHIP_ID_EM2884:
 769                 case CHIP_ID_EM2874:
 770                 case CHIP_ID_EM28174:
 771                 case CHIP_ID_EM28178:
 772                         ir->get_key = em2874_polling_getkey;
 773                         rc->allowed_protocols = RC_BIT_RC5 | RC_BIT_NEC |
 774                                              RC_BIT_RC6_0;
 775                         break;
 776                 default:
 777                         err = -ENODEV;
 778                         goto error;
 779                 }
 780
 781                 rc->change_protocol = em28xx_ir_change_protocol;
 782                 rc->map_name = dev->board.ir_codes;
 783
 784                 /* By default, keep protocol field untouched */
 785                 rc_type = RC_BIT_UNKNOWN;
 786                 err = em28xx_ir_change_protocol(rc, &rc_type);
 787                 if (err)
 788                         goto error;
 789         }
 790
 791         /* This is how often we ask the chip for IR information */
 792         ir->polling = 100; /* ms */
 793
 794         /* init input device */
 795         snprintf(ir->name, sizeof(ir->name), "em28xx IR (%s)", dev->name);
 796
 797         usb_make_path(dev->udev, ir->phys, sizeof(ir->phys));
 798         strlcat(ir->phys, "/input0", sizeof(ir->phys));
 799
 800         rc->input_name = ir->name;
 801         rc->input_phys = ir->phys;
 802         rc->input_id.bustype = BUS_USB;
 803         rc->input_id.version = 1;
 804         rc->input_id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
 805         rc->input_id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
 806         rc->dev.parent = &dev->udev->dev;
 807         rc->driver_name = MODULE_NAME;
 808
 809         /* all done */
 810         err = rc_register_device(rc);
 811         if (err)
 812                 goto error;
 813
 814         em28xx_info("Input extension successfully initalized\n");
 815
 816         return 0;
 817
 818 error:
 819         kfree(ir->i2c_client);
 820         dev->ir = NULL;
 821         rc_free_device(rc);
 822         kfree(ir);
 823         return err;
 824 }
 825
 826 static int em28xx_ir_fini(struct em28xx *dev)
 827 {
 828         struct em28xx_IR *ir = dev->ir;
 829
 830         if (dev->is_audio_only) {
 831                 /* Shouldn't initialize IR for this interface */
 832                 return 0;
 833         }
 834
 835         em28xx_info("Closing input extension\n");
 836
 837         em28xx_shutdown_buttons(dev);
 838
 839         /* skip detach on non attached boards */
 840         if (!ir)
 841                 goto ref_put;
 842
 843         rc_unregister_device(ir->rc);
 844
 845         kfree(ir->i2c_client);
 846
 847         /* done */
 848         kfree(ir);
 849         dev->ir = NULL;
 850
 851 ref_put:
 852         kref_put(&dev->ref, em28xx_free_device);
 853
 854         return 0;
 855 }
 856
 857 static int em28xx_ir_suspend(struct em28xx *dev)
 858 {
 859         struct em28xx_IR *ir = dev->ir;
 860
 861         if (dev->is_audio_only)
 862                 return 0;
 863
 864         em28xx_info("Suspending input extension\n");
 865         if (ir)
 866                 cancel_delayed_work_sync(&ir->work);
 867         cancel_delayed_work_sync(&dev->buttons_query_work);
 868         /* is canceling delayed work sufficient or does the rc event
 869            kthread needs stopping? kthread is stopped in
 870            ir_raw_event_unregister() */
 871         return 0;
 872 }
 873
 874 static int em28xx_ir_resume(struct em28xx *dev)
 875 {
 876         struct em28xx_IR *ir = dev->ir;
 877
 878         if (dev->is_audio_only)
 879                 return 0;
 880
 881         em28xx_info("Resuming input extension\n");
 882         /* if suspend calls ir_raw_event_unregister(), the should call
 883            ir_raw_event_register() */
 884         if (ir)
 885                 schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
 886         if (dev->num_button_polling_addresses)
 887                 schedule_delayed_work(&dev->buttons_query_work,
 888                                       msecs_to_jiffies(dev->button_polling_interval));
 889         return 0;
 890 }
 891
 892 static struct em28xx_ops rc_ops = {
 893         .id   = EM28XX_RC,
 894         .name = "Em28xx Input Extension",
 895         .init = em28xx_ir_init,
 896         .fini = em28xx_ir_fini,
 897         .suspend = em28xx_ir_suspend,
 898         .resume = em28xx_ir_resume,
 899 };
 900
 901 static int __init em28xx_rc_register(void)
 902 {
 903         return em28xx_register_extension(&rc_ops);
 904 }
 905
 906 static void __exit em28xx_rc_unregister(void)
 907 {
 908         em28xx_unregister_extension(&rc_ops);
 909 }
 910
 911 MODULE_LICENSE("GPL");
 912 MODULE_AUTHOR("Mauro Carvalho Chehab");
 913 MODULE_DESCRIPTION(DRIVER_DESC " - input interface");
 914 MODULE_VERSION(EM28XX_VERSION);
 915
 916 module_init(em28xx_rc_register);
 917 module_exit(em28xx_rc_unregister);